#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>

double S(double a,double b)
{
	double S = a * b;
	return S;
}
int main() 
{
	S(3, 4) > S(5, 6) ? printf("%.2lf", S(3, 4)) : printf("%.2lf", S(5, 6));
	return 0;
}